How to Get Emulators to Work?

Hey guys,
I'm new here but this looks like a great forum. I just found out about emulators and have been reading alot about them. And have downloaded the emulators on this site for Xbox and PS2. But I'm having trouble getting them to work, mainly because I just have no Idea what I'm doing. Please help me out with settings and such.

Thanks Everyone.

Both of those don't work especially if you are trying to run commercial games.

Thanks for the reply,
The problem is I don't know how to get them to work even with regular downloaded roms. Do I just Find the file and try to open it in the emulator? Or what? And are there better PS2 or Xbox emulators than whats on this site?

Thnx,

As of now, there are NO emulators that can play commercial games for the Xbox, PS2, or Gamecube. There's no point in trying to get a game to work. Even if a game manages to load, you'd get 1-2 frames per second and with major glitches.

WOW! Letters and numbers like 2, 4 and u can also be used as words like too, for, and you!!! I'm so impressed right now.